Canon M3010 Series Service Manual

Contents

Canon M3010 Series Service Manual Manual pdf 40 page image

22 2-252-25Technical Overview > Pickup Feed System > Detecting Jams > Delay JamTechnical Overview > Pickup Feed System > Detecting Jams > Delay JamDetecting Jams■ Jam Detection Outline● OverviewThe following sensors are installed to detect absence/presence of papers and whether papersare correctly fed.• Fixing Delivery Sensor (PS701)• Paper Width Sensor (PS702)• Paper Leading Edge Sensor (PS751)PS702PS751PS701Whether jam occurs or not is judged according to whether a paper is absent/present on thesensor at the check timing that has been stored in the CPU of the engine controller.When the engine controller judged that jam has occurred, print operation is stopped and jamoccurrence is noticed to the main controller.NOTE:Jam detection timing may differ for 400 dpi and 600 dpi printing. In such a case, settingvalues applicable to 600 dpi printing are indicated in parentheses following those for400 dpi printing.F-2-25■ Delay Jam● Delivery Delay JamThere are 3 cases of delivery delay jam detection.A. No preceding sheetB. Preceding sheet exists 1 – short paper interval with the preceding sheetC. Preceding sheet exists 2 – long paper interval with the preceding sheetA. No preceding sheetOFFPaper Leading EdgeSensor (PS751)Fixing DeliverySensor (PS701)ONOFFONJam1490(2235)msec Paper Detection PeriodWhen the Fixing Delivery Sensor (PS701) cannot detect presence of paper within 1490 (2234)msec. after the Paper Leading Edge Sensor (PS751) detects the paper, it is judged as adelivery delay jam.NOTE:The above 1490 (2235) msec value accounts for the 126.26 mm distance from thePaper Leading Edge Sensor (PS751) to the Fixing Delivery Sensor (PS701), plus 40mm margin. Since the distance from the fixing nip to the Fixing Delivery Sensor (PS701)is 22.9 mm, the length of wrapping from the leading edge is 62.9 mm. Since one lapof the fixing film is 18.2 pi (57.2) mm, the wrapping is longer than one lap. However,allowing for paper arch, sensor accuracy and heavy paper feeding capability, etc., thevalue cannot be further reduced.F-2-26